Grate



May 10 1927.

c. c. RANSDELL GRATE Filed April 14, 1926 I5 sheetsfsheet 2 GRATE 3 sheet sheet 3 7 Filed April 14, 1926 Cf Ms'deZZ INVENTOR ATTOR N EY Patented May 10, 1927.

'UNITED STATES PATENT OFFICE.

CLARENCE CLEVELAND BANSDELL, OF MONROE CITY, MISSOURI, ASSIGN'OR OF ONE- IIALF T0 W. L. HARRISON, OF SHELBINA MISSOURI, AND ONE-FOURTH TO 3'. C.

DELONAY, 0F MONROE CITY, MISSOURI.

GBATE.

Application filed April 14, 1926. Serial No. 102,023.

The object of this invention is to provide a grate for use under locomotive, marine, and stationary boilers, and designed for burning slack coal or any form of coal screenings.

Afurtherobject is to provide a grate 1ncluding a plurality of perforated cylinders, having portions thereof cut away, and each mounting therein a second cylinder, also having a portion cut away, the inner cylinders being adapted for rotation for con trolling the air supply thru the outer perforated cylinders, or for the purpose of dumping the ashes.

A further object is to provide particular neans for rotating the inner cylinders.

With the foregoing and other objects in view, the invention consists in the novel construction and arrangement of elements described, illustrated and claimed, it being understood that modifications may be made within the scope of the claims, without departing from the spirit of the invention.

In the drawings forming part of this application,

Figure 1 is a view of the grate in top plan.

Figure 2 is a view in side elevation, the outer structure being in section on line 2-2 of Figure 1.

Figure 3 is a longitudinal section, on line 33 of Figure 1.

Figure 4: is a section online 4. l of Figure 1.

Figure 5 is a section on line 5-5 of Fig- I ure 1.

Figure 6 is a section on line 66 of Figure 1.

In Figure 1, the walls of a furnace structure are designated 10, 11, 12 and 13, and a bridge wall is shown. Within this structure I mount a plurality of grate bars, constituting cylinders, v and each cylinder having mounted therein a second cylinder adapted for partial rotationwith reference to the cylinder first named.

The outer cylinders are designated 15, and are cut away longitudinally as shown at 16, the edges of the cut away portion being designated 17 and 18. The outer cylinders are provided with the series of perforations 19, thru which air is introduced to the fire bed, the air being supplied by duct 20 having connection with each of the cylinders 15 thru tubular members 21.

The innercylinders are designated 24:, and are each rotatable thru a portion of a revolution, the extent of movement being limited by a bar 25 secured to the outer cylinders, and extending longitudinally thereof, as shown in Figures l and 5.

Each outer cylinder includes an end wall 15, and each inner cylinder includes a heavy end wall 241, providing sufficient strength for mounting an axial member 27 carrying a segmental toothed element 28. The elements 28 mesh with rack bars 29 and 30, these rack bars being secured by means of brackets or the like 31 to bars or rods 32 and 32, which are movable by means of levers 33 and 34. The levers are pivoted. at 35, and are connected with bars 32 and 33 at the points designated 36, a pin and slot connection being provided. 7

The grate bars thus formed are preferably mounted for operation in groups, and in the drawings each lever and rack bar controls the shaking and dumping operation of six grate bars of the particular form specified. The total number of bars varies with the size of the furnace.

The inner cylinders 24 are cutaway longitudinally at points between the ends thereof, in order to provide elements complementary to the outer cylinders 16, and these inner cylinders are provided with ports 38, adapted to register, when desired. with the inlet connections 21 in order to establish communication with air duct 20. The inn-er cylinders may be rotated for closingthe perforations of the outer cylinders, and may be rotated for producing the shaking operation and for dumping the ashes.

The grate bars are supported by brackets of approximately U form and designated 40, these brackets being carried by the transverse elements or I-beams 41 and 42.

Having thus described the invention, what I claim is: I

1. In a grate, a plurality of hollow cylindrical grate elements having portions cut away longitudinally, cylinders mounted within said hollow elements, the cylinders last named also being cut awaylongitud'rnally, and means for partly rotating the cvlinders last named.

2. In a grate, a plurality of hollow per forated cylindrical grate elements having portions cutaway longitudinally, intermediate oi the ends of the cylinders, cylinders mounted within said hollow elements, the cylinders last named being cut away longitudinally, and means for conducting air to a fire bed thru Said cylinders.

3. In a grate, a plurality of hollow cylindrical grate elements ha-vin portions cut away longitudinally, cylinc ers mounted .within said hollow elements, the cylinders last named also being cut away longitudinally, and means for partly rotating the cylinders last named, said means incluc ing rack bars and segmental toothed elements connected with the inn-er cylinders and engaging the rack bars.

4. In a grate, a plurality of cylindrical grate elements having perforations therein, said elements being hollow and each having a portion cut away longitudinally intermediate of its ends, inner cylinders similarly cut away, a main air duct, the cylinders being provided with openings for conveying air therethru from the duct to the fire bed, and means for rocking the inner cylinders in groups.

reezgeee 5. In a grate, a plurality of cylindrical grate elements having perforations therein, said elements being hollow and each having a portion cut away longitudinally interme diate of its ends, inner cylinders similarly cut away, a main air duct, the cylinners being provided with openings for conveying air therethru from the duct to the fire bed, and means for rocking the inner cylinders in groups, said means including longitudinally movable rods and segmental pinions engaging the rods and rigid with reference to the inner cylinders.

6. A; grate bar, comprising a plurality of concentric tubular elements relatively rotat able and each having a portion cutaway 1011- gitudinally intermediate of its ends, the cylinders being provided with openings for conducting air therethru to a fire bed, and

the cut away portions of the cylinders being complementary to each other.

In testimony whereof I aifix my signature.

CLARENCE CLEVELAND RANSDELL. 

